Synthesis,Conversion And Application Study Of Several Rare Earth Coordination Polymer Nano-materials

Rare earth coordination polymer nanomaterials are a new type of nanomaterials that exhibit many excellent properties and have broad application prospects in many fields such as optics,magnetism,catalysis,and biological analysis.On the other hand,materials prepared with a coordinating polymer as a precursor tend to exhibit superior performance and higher activity than materials prepared by other methods.Based on this,this paper in several rare earth coordination polymer as the research object,using solvent hot method the ytterbium erbium doped total request for coordination polymer nano ball and microwave in yttrium oxide and doped porous superfine ball,under the pressure of microwave without the template method is used to synthesis of ceria nanoparticles,and the preparation of the ceria-cadmium sulphide heterostructure nano ball,and explore the influence of various reaction conditions on product,the integrated use of a variety of characterization methods for characterizing the product analysis.We mainly studied the fluorescence,magnetic and catalytic properties of the products.This work provides some theoretical basis and methodological route for the study of other functional nanomaterials.?1?Preparation of ruthenium-doped ruthenium-based coordination polymer nanospheres and their upconversion luminescence properties.The cerium nitrate hexahydrate is used as the metal ion,the rare earth cerium is the doping ion,and the pyridine-2,5-dicarboxylic acid is the organic linking body.The surface is smooth,the morphology is uniform and the dispersion is good by the solvothermal method.A ruthenium-doped up-converting micro-nanosphere of about500-600 nm.The best experimental conditions were selected through a series of experimental conditions:the rare earth doping ratio was Gd³⁺:Yb³⁺:Er³⁺=50:25:25,and the ratio of metal ions to organic ligand was 0.1 mmol:0.1 mmol.The temperature was 210?and the reaction time was 12 h.The experiment does not require the addition of any surfactant or dispersant.At the same time,the upconversion luminescence properties of the coordination polymer prepared before and after calcination were compared.The results show that the typical product has the best luminescence performance after calcination at 1000?for 4 h in air atmosphere,and the magnetic properties of the product are studied.The product has typical paramagnetism and T₁-weighted imaging characteristics.?2?Synthesis and Luminescence Properties of Y₂O₃ and Its Doped Micro/Nano Materials.Using pyridine-2,5-dicarboxylic acid as a ligand,the modified domestic microwave oven?power continuously adjustable?rapidly prepared ruthenium-based coordination polymer ultrafine spheres as a heat source,and the results showed that the synthesized product had a very good particle distribution.Uniform,and has good dispersibility,particle size between 300-500 nm.Based on this,the ruthenium-based coordination polymer ultrafine spheres doped with cerium and cerium ions were prepared,and then calcined in 800?air atmosphere for 4 h to obtain the product,namely Y₂O₃:Yb³⁺,Er³⁺porous microspheres.In addition,the luminescent properties of fluorenyl coordination polymers and Y₂O₃:Yb³⁺,Er³⁺porous microspheres were investigated.The results show that the Y₂O₃:Yb³⁺,Er³⁺porous ultramicrosphere hollow ultrafine spheres have stronger luminescence intensity than their precursors.?3?Synthesis of cerium oxide nanoparticles by pressureless microwave assisted method.Using ruthenium nitrate as the ruthenium source and pyridine-2,5-dicarboxylic acid as the ligand,the pH value was adjusted with ammonia water,and a microwave-assisted synthesis of the coordination polymer of ruthenium dioxide was carried out by a template-free synthesis method.The calcined precursor was calcined at 600?for 4 h in a furnace,and cooled to room temperature to obtain cerium oxide nanoparticles.The synthesized products were subjected to basic characterizations such as TEM,XRD,Uv.The research shows that the template-free method has a series of advantages such as heating environment cleaning:1.uniform heating and small thermal gradient;2.less side reactions and high product purity;3.low energy consumption and high energy utilization rate;4.fast heating speed and short reaction time;This method provides a fast and efficient method for the synthesis of nanoscale cerium oxide.?4?Preparation and properties of cerium oxide-cadmium sulfide heteronuclear bimetallic coordination polymer.Heterometallic?M=Ce and Cd?coordination polymer nanospheres were synthesized by solvothermal method using terephthalic acid?PTA?and L-cysteine?CYS?as organic ligands.A series of characterizations.The obtained product was then calcined under a N₂ atmosphere to obtain a cadmium-cadmium heterometal heterojunction nanomaterial.The typical products were well characterized and analyzed.The heterostructure exhibits excellent degradation properties against Rhodamine B?RhB?under ultraviolet light irradiation,and also explores a degradation mechanism that may be formed therein.The product morphology after the degradation reaction was compared with the product before degradation,and the product was found to have good stability and cycle performance.In addition,we used the same experimental method to prepare all the coordination polymers of rare earth and cadmium sulfide,and cerium oxide and other metal sulfides.After calcination,the corresponding heterostructures of oxides and sulfides were obtained and made some simple characterization analysis.